Patent US3220307A successfully refreshed from Google Patents.
US3220307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable focal length lens system having linear differential motion between lens unit
Assignee: Individual
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Filing: 1960-12-05
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Granted: 1965-11-30
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Expires: 1980-12-05
Abstract
No abstract record available.
Inventors
- 👤 James E Thurow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A VARIABLE FOCAL LENGTH LENS SYSTEM COMPRISING AT LEAST FIRST AND SECOND OPTICALLY ALIGNED LENS UNITS, MEANS FOR MOVING SAID FIRST AND SECOND LENS UNITS RELATIVE TO EACH OTHER AT SOME PREDETERMINED LINEAR RATE IN WHICH:
Claim 2
Dependent Claim
36 words
A VARIABLE FOCAL LENGTH LENS SYSTEM COMPRISING AT LEAST FIRST AND SECOND OPTICALLY ALIGNED LENS UNITS, MEANS FOR MOVING SAID FIRST AND SECOND LENS UNITS RELATIVE TO EACH OTHER AT SOME PREDETERMINED LINEAR RATE IN WHICH:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |